Grate-bar.



No. 702,891. Patented lune I7,v |902` H. TRUESDELL.

GHATE BAB.-

(Application filed Mar. 2, 1906.)

(Hu Model.)

mmes es Inv 'erojr UNITED STATES PATENT OFFICE.

HENRY TRUESDELL, OF TORONTO, CANADA.

G RATE-BAR.

SPECIFICATION forming part of Letters Patent N o. 702,891, dated J' une 17, 1902.

Application filed March 2, 1900. Serial No. 7,137. (No model.)

To all wtont t 11u02/ concern:

Be it known that I, HENRY TEUEsDELL, a citizen of the United States, residing at 16 Camden street, in the city of Toronto, inthe county of York and Province of Ontario, Canada, have invented certain new and useful Improvements in Grate-Bars; and I hereby declare that the following is a full, clear, and exact description of the same.

The object of this invention is to so construct a grate-bar that it will provide a sufiicient draft to the lire to produce a practically perfect combustion and to so arrange the grate-bar that it can be cheaply and economically made and repaired and simply operated; and the grate-bar consists, essentially, of a substantially rectangular frame and a series of transverse sections connected to the rectangular frame, the top surfaces of which are provided with longitudinal grooves or corrugations extending from end to end of the grate-bar, as hereinafter more fully set forth, and more particularly pointed out in the claim. A

In producing the present invention it has been my main object to make a much simpler and more practical grate than the one described in my patent issued August 7, 1900, No. 655,663, and also the Patent No. 499,732,

issued June 20, 1893. The improvement overv these patents lies in the construction of the ends, the brace-Webs, and the longitudinal bars, these bars and brace-webs being provided with slight grooves, which aline with corrugations of the sections and ends, and thus present surfaces which do not allow the collection of ashes and clinkers in the grate, and thus prevent the clogging thereof. The parts are also made integral and are so made as to thoroughly support the entire grate and prevent sagging when subjected to a great heat.

In the drawings, Figure 1 is a perspective view of a grate-bar. Fig. 2is a longitudinal section through the same. Fig. 3 is a transverse section.

Like letters of reference refer to like parts throughout the specication and drawings.

A represents the frame of the grate-bar, which consists of two opposite and parallel sides ct a and two ends a a. Each of the sides a d is substantially truss-shaped, as shownin Fig. 1, and the top of each of the sides is provided with a longitudinal corru gation or groove a, extending from end to Vend of the same.

Formed integrally with the sides d a are a series of transverse sections B, the top of which are on thesame plane and of the same shape as the ends ct' ct. By referring to Fig. 3 of the drawings it will be noticed that the top of each of the ends and sections is of a convexed nature.

Extending along the` middle of the top of the sections B and ends a a is a groove or corrugation O, and at each side of the groove or corrugation C is a groove or corrugation D. The grooves or corrugations D are intermediate the grooves or corrugations C and the grooves or corrugations ct" a. By reference to the Vdrawings it will bev noticed that the ends a' ce and sectionsB project beyond the sides da of the frame and that grooves or corrugations E extend alongthe top of the projecting ends a a and sections B from end to end of the grate-bar.

The sections B in cross-section are substantially wedge-shaped in order that the space A between the sections at the bottom will be greater than at the top to provide an increase in theforce of the draft through the grate- The under side of each of the sections B intermediate the sides of the frame is concaved or arch-shaped to provide, rst, for a free circulation of air from end to end of the grate-bar between the sides, and, second, to reduce the weight of the grate-bar and at the same time enable the sections to successfully sustain their load. By means of this construction a sufficient draft to the fire is provided to establish a practicallyperfect combustion.

Projecting-outwardly from the middle of each end a is a trunnion F, and depending from one of the ends a is a lug Gr, having a hole in its lower end. The frame, sections, trunnion, and lug are preferably cast in one piece. In order to strengthen the ends o. a in line with the trunnions, I provide the short webs a3 a3, which connect said ends with the next adjacent sections B B, as clearly shown in Figs. land-2. These webs c3 strengthen IOO the grate-bars at these points and prevent warping, and as only two of suoh Webs are employed the draft is not impeded.

By providing the longitudinal oorrugations along the top surfaces of the grate-bar a passage is provided for the air-current to combine before reaching the fire.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A grate-bar made in a single casting and comprising two ends having each a series of oorrugations upon their upper edges,/ trunnions formed upon the outer faces thereof, a lug depending from Jthe lower portion of one of the ends so that a series of the bars may be secured to be rocked in unison, a pair of longitudinal parallel bars connecting the ends together and having their upper edges grooved and in line with the oorrugations of said ends, a series of transverse sections in parallel with the ends and supported by the bars, said sections being provided with corrugations similar in shape and number to the corrugations of the ends and having the same ones in line with said bars, said sections also having their lower edges in the same line but above the lower edges of the bars, and brace-webs connected to the inner faces of the ends and adjacent faces oi' the outer sections intermediate of the bars so that each brace-Webs groove is in line with the central corrugation of the ends and sections.

Toronto, February 7, 1900.

H. TRUESDELL. ln presence of- C. H. RICHEs, GEO. H. KILMER. 

